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Oracle 10 how to update table as sum

I have two tables with the same columns ID

, A

, B

, C

.

I need to add to the TableX

values ​​from TableY

for the relevant ones ID

. I know how to do it for SINGLE update like this:

update TableX x
set x.A= x.A +
    (select y.A
    from TableY y
    where x.id= y.id)
where exists (select y.id
    from TableY y
    where x.id = Y.id).

But how do I change this statement so that I can update multiple columns as sums?

TIA

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3 answers 


update TableX x
set (x.A, x.B, x.C) = (select y.A + x.A,
                              y.B + x.B,
                              y.C + x.C
                       from TableY y 
                       where x.id= y.id)
where exists (
  select y.id 
  from TableY y 
  where x.id = Y.id)


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merge into tableX x
using (select * from tableY) y
on (x.id = y.id)
when matched then update set
  x.a = x.a + y.a, x.b = x.b + y.b, x.c = x.c + y.c;

SQLFiddle



You can use merge , especially if you want to insert non-existing lines.

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We can do it in Teradata like this:

Update X
From TableX X,
(Select A,B,C From TableY Where id in (select id from TableX group by 1)) S
set
A=A+S.A
,B=B+S.B
,C=C+S.C
where exists (select y.id
from TableY y
where x.id = Y.id)
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